Listing is for eighteen (18) each right and left hand tines for a John Deere Model 660, a full set, codes PT8444 & PT8445 or PT8446 & PT8447.  The PT8444 and PT8445 are tines with a "L" shape and the PT8446 and PT8447 are tines with "C" shape. This listing is for the PT8446 & PT8447 "C" tines, which can be used to replace either style, once mounted they are completely interchangeable. Both have two mounting holes roughly 2-1/4" on center. This is a full replacement set for a John Deere Model 660 tiller
Specifications
Heat Treated Boron Steel
Two 11.5mm (0.452") holes that are 57mm (2.244") on center
L: 175mm (6.889")
H: 140mm (5.511")
Use diagram in pictures to match up "L" and "H" dimensions
Plate: 75 mm X 6 mm / 2.952" X ..236" before forging
Wt. 1.851 lbs